Microbiology of waste water treatment and methane production

ContentWaste water treatment

N- and P-removalMethanogenesis

Thermodynamics of fermentationsGlobal methane production

Water quality

TOCTotal Organic Carbon

CODChemical Oxygen Demand

BODBiochemical Oxygen Demand

Fill and Draw system

3 biopolymers

Anaerobic digestion

Upflow Activated Sludge Blanket (UASB) reactor

Methanogenesis

MethanogensFermentation reactions

ThermodynamicsGlobal methane production

Fig. 27.2 Carbon cycle

Nernst equation

aA + bB cC + dD

ΔG’ = ΔGº’ + RT ln (C)C (D)d/(A)a(B)b

ΔG’ = ΔGº’ + 5.7 log (C)C (D)d/(A)a(B)b

Do not include H2O or H+

(they are constants under standard conditions)Gases can be expressed in partial pressures (atm)

Increase atmospheric CH4